Half to albert anderson



(No Model.)

J. M. ANDERSEN.

INSULATOR. V

Patented June 26,1894.

II, #0 II A a A g m $2125:22E:

UNITED STATES PATENT OEFIQE.

JOHAN M. ANDERSEN, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE HALF TO ALBERT ANDERSON, OF SAME PLACE.

INSULATOR.

SPECIFICATION forming part of Letters Patent No. 522,175, dated June 26, 1894. Application filed March 22, 1894. Serial No. 504,606. (No model.)

scribed. The shield or guard will preferably To whom it may concern.-

Be it known that I, JOHAN M. ANDERSEN, residing in Boston, in the county of Suffolk and State of Massachusetts, have invented an Improvement in Insulators, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention relates to a novel insulator especially designed and adapted to be used as a support for the feed wires of the overhead system of electric railways.

The invention has for its object to provide a simple and efficient insulator of the class referred to, capable of supporting substantially large wires or a cable of wires, and of such construction as will be described as to securely fasten the cable or wire to the insulator and yet permit of its being easily and quickly removed therefrom when desired, the said insulator being particularly well adapted to be used with metal supporting pins, as will be described.

In accordance with this invention, the main or body portion of the insulator is composed of insulating material molded or otherwise formed into the shape desired, and preferably provided with a threaded socket adapted to be screwed upon a threaded supporting pin, which may be of metal or wood, the said body portion being provided with a metal cap, top or crown having substantially upright arms or cars, forming a slot, channel or groove between them for the reception of the cable or wire to be supported, the said upright arms or cars having secured to them a cover or cap, by which the said slot or groove is closed at its top and the cable or wire locked therein. The upright arms or cars are preferably provided with screw threads to be engaged by screw threads on the cap or cover, and I prefer to employ a guard or shield in the slot or opening, to engage the upper surface of the cable or wire therein, and which'is acted upon by the cap or cover, so that/when the latter is fitted on and secured to the insulator, the shield will be pressed against the upper surface of the cable, and will prevent injury to the insulation of the same, as will be debe of novel construction to enable it to be locked in the slot or groove by the cover as will be described. These and other features of this invention will be pointed out in the claims at the end of this specification.

Figure 1 is a side elevation of a pole insulator embodying thisinvention; Fig. 2, a vertical section on the line 2-2, Fig. 1; Fig. 3, a partial section and elevation of the insulator on the line 3-3, Fig.2, tomore clearly show the guard or shield in its operative position, and Fig. 4, a top or plan view of the guard or shield preferred by me and shown in Figs. 2 and 3.

In the present embodiment of this invention, the insulator is shown as substantially bell-shaped, the main or body portion a of the insulator forming the lower part of the same, being composed of insulating material,

which is preferably molded into the desired form or shape and is provided with a threaded socket a for the reception of a threaded supporting pin a (see Fig. 2.) The body a of the insulating material is provided with a metal crown or top a firmly secured to the said body, it being shown as substantially bell-shaped to conform to the shape of the body a, and provided at its lower end with an interior annular flange a forming a locking projection embedded in the insulating body a, and by which the said metal crown or top is firmly secured to the said body. In practice, the insulating body a is molded into the bell-shaped crown or top a and the said body is made of such size or height as to leave a substantially large body of insulating material below the bottom of the crown or top or. for a purpose as will be described.

In accordance with this invention, the metal crown or top a is provided with two upright 0 arms or ears I) 1), preferably cast integral with the crown or top a and of-sufficient width to extend substantially across the same, to form a substantially long channel, slot or groove 1) between the said arms, and within which the insulated wire 11 or it may be a cable of wires, is extended. The substantially wide arms or ears I) b are preferably curved or rounded at their lower inner side, so as to substantially conform to the rounded form of the insulated wire, so that the latter may have a bearing surface for substantially one-half of its circumference. The slot or channel or groove 12 formed by the upright arms I) b is inclosed at its top by means of a cap or cover 0, preferably provided with an intern lly threaded downwardly extended annular flange c, the screw threads of which are adapted to engage screw threads 0 on the upper portion of the upright arms, the said upper portion of the said arms being made in the form of an arc of a circle on their outer side, sothat the cover 0 may be readily screwed upon and unscrewed from the said arms. The upright arms I) b below the screw threaded upper portion are preferably strengthened by a reinforcing web 0 (see Fig. 1) connecting the upright arms with the metal crown (13, whereby the said upright arms are rendered sufficiently strong to withstand severe strain placed upon them by the swaying of the wire or cable supported by the insulator.

In order that the insulating covering 0 of the wire 6 may be protected against the cutting action of the depending flange c on the cover or cap 0, when the latter is fitted upon the upright arms and in position to firmly clamp the insulated wire to the insulator, I prefer to employ a preferably metallic guard or shield of substantially the construction shown in Fig. 4, it consisting of aplate cl provided on its upper side with an upright web (1', the plate 61 being made of substantially the same width as the slot or opening 12 so as to fit substantially snug therein, and the said shield is provided at its ends on its opposite sides, with projecting corners, lugs or cars 61 adapted to embrace or fit over the opposite ends or the upright arms or cars b. b as clearlyshown in Fig. 1, to thereby look the shield in the slot or opening 11 against longitudinal movement or displacement. The upright web d is preferably made of substantially the same width as the plate d so as to prevent canting of the shield, when the wire is not placed in the slot b and thereby enable the shield to be placed in the slot of the insulator and to be shipped without danger of its being lost.

The cover 0 when fitted to the insulator presses against the ends of the plate d beyond the arms b I) (see Fig. 1) and forces the plate (1 down onto the upper surface of the insulating covering 0 for the wire or cable supported by the insulator, to thereby firmly secure or, as it were, lock the wire in the slot or openlug b without danger of injuring the said insulation.

The wire 11 may be supposed to be the feed Wire of the overhead system of electric railways, and while this insulator is especially designed for use with such a wire, it is evident that it might be employed with a cable of wires or with a wire other than a feed wire.

I have herein represented the body a of the insulator as substantially bell-shaped in form, but I do not desire to limit my invention in this respect as the said body portion may be made of any other desired or suitable shape. I prefer to employ the threaded cap and to make the outside of the upright arm screw threaded in order that the threaded cap may be screwed upon the same, but I do not desire to limit my invention in this respect, for while this construction is superior, the said cap might be secured to the upright arms in other ways than that herein shown, but, as I believe, not with such good results.

The pin a may be made of wood or it may be of metal, and when the said pin is made of metal, the insulator herein-described is especially advantageous, for the reason that the metal crown or top a is separated from the metal supporting pin a by a substantially large or thick body of insulating material, so that if the current in the wire Z2 should leak through to the metal crown or top a the danger of its jumping to the metal supporting pin or to the support for said pin is obviated or reduced to a minimum.

1 claim 1. An insulator composed of a body portion of insulating material, a metal crown having upright arms or cars forming a slot or channel for the reception of the conductor to be supported, and a cap fitted upon the said upright arms to close the said slot at its upper end, substantially as described.

2. An insulator composed of a body portion of insulating material,a metal crown having upright arms or ears forming a slot or channel for the reception of the conductor to be supported, a shield or guard fitted in said slot and adapted to engage the upper surface of the said conductor, and a cap fitted upon the said upright arms to close the said slot at its upper end and provided with a depending flange to engage the said shield or guard, substantially as described. I

3. An insulator provided with a metal crown having substantially wide upright arms forming a slot or channel for the reception of the conductor to be supported, strengthening ribs connecting said upright arms with the said crown, and a cap provided with a threaded flange to engage screw threads on the upright arms, substantially as described.

4. An insulator composed of a bodyportion of insulating material, a metal crown having upright arms or ears forming a slot or channel for the reception of the conductor to be supported, and a cap or cover detachably secured to said arms to close the said slot or channel at its top or upper portion, substantially as described.

5. An insulator composed of a body portion of insulating material, a metal crown having upright arms or ears forming a slot or channel for the reception of the conductor to be supported and provided with screw-threads, and a detachable cover or cap having screwthreads to engage the said screw-threaded arms to close the said slot at its upper end, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

J OI'IAN M. ANDERSEN.

Witnesses:

JAS. H. CHURCHILL, J. MURPHY. 

